Solar mean magnetic field of the chromosphere

IF 1.1 4区物理与天体物理 Q3 ASTRONOMY & ASTROPHYSICS

Journal of Astrophysics and Astronomy Pub Date : 2023-06-09 DOI:10.1007/s12036-023-09944-w

M. Vishnu, K. Nagaraju, Harsh Mathur

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Abstract

The Solar Mean Magnetic Field (SMMF) is the mean value of the line-of-sight (LOS) component of the solar vector magnetic field averaged over the visible hemisphere of the Sun. So far, the studies on SMMF have mostly been confined to the magnetic field measurements at the photosphere. In this study, we calculate and analyse the SMMF using magnetic field measurements at the chromosphere, in conjunction with that of photospheric measurements. For this purpose, we have used full-disk LOS magnetograms derived from spectropolarimetric observations carried out in Fe i 6301.5 Å and Ca ii 8542 Å by the Synoptic Optical Long-term Investigations of the Sun (SOLIS)/Vector Spectromagnetograph (VSM) instrument during 2010–2017. It is found from this study that the SMMF at the chromosphere is weaker by a factor of 0.60 compared to the SMMF at the upper-photosphere. The correlation analysis between them gives a Pearson correlation coefficient of 0.80. The similarity and reduced intensity of the chromospheric SMMF with respect to the photospheric SMMF corroborate the idea that it is the source of the Interplanetary Magnetic Field (IMF).

Abstract Image

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色球层的太阳平均磁场

太阳平均磁场(SMMF)是在太阳可见半球上平均的太阳矢量磁场的视距分量的平均值。迄今为止，对SMMF的研究大多局限于光球层的磁场测量。在这项研究中，我们计算和分析了SMMF使用磁场测量在色球，结合光球测量。为此，我们使用了2010-2017年由太阳天气光学长期研究(SOLIS)/矢量谱磁仪(VSM)仪器在Fe i 6301.5 Å和Ca ii 8542 Å进行的光谱偏振观测所得的全盘LOS磁图。本研究发现，色球层的SMMF比上层光球层的SMMF弱0.60倍。它们之间的相关分析得出Pearson相关系数为0.80。色球SMMF与光球SMMF的相似性和强度的降低证实了它是行星际磁场(IMF)来源的观点。

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来源期刊

Journal of Astrophysics and Astronomy 地学天文-天文与天体物理

CiteScore

1.80

自引率

9.10%

发文量

审稿时长

>12 weeks

期刊介绍： The journal publishes original research papers on all aspects of astrophysics and astronomy, including instrumentation, laboratory astrophysics, and cosmology. Critical reviews of topical fields are also published. Articles submitted as letters will be considered.